Inventor: de Boer, Petrus
Inventor: de Boer, Petrus
Inventor: Van Andel, Otto Jan Robert
Inventor: Van Andel, Otto Jan Robert
Inventor: Unger, Michael H.
Inventor: Unger, Michael H.
Inventor: Moolenaar, Alfred Nicol
Inventor: Herrick, Robert D.
Inventor: Reuther, Gerhard
Inventor: Mills, Wayne J., Hampton, Katherine L.
Inventor: Hofland, G. Jack
Inventor: Niedfeldt, Carl J.